Non-weight loss

Does 'on a regular basis' mean every day without fail and accurately? Do you have a way of estimating your calorie burn from exercise correctly (or not eating back all your exercise calories to compensate)? It's not really a case of people thinking that you're lying but that you might be missing something. Do you weigh all your food using a scale? If not, your calories may be very inaccurate. What time of day do you weigh yourself? Water retention from sodium and exercise as well as weight from food can obfuscate weight changes. How long has it been? Trying for too much weight loss in a short period of time doesn't always work out, resultswise. The body doesn't necessarily work with 'should have's

Age can have an effect on metabolism, but there are lots of older people who have lost weight successfully and kept it off.

If you are doing everything correctly and are not losing any weight at all then you should see a doctor to see if there is anything wrong hormonally.

If you're not losing, then you're not eating at a deficit. You're not necessarily a liar, though.

1. Get a food scale. Weigh everything you eat. (If you really hate it, put an empty measuring cup or spoon on your scale. Zero out the scale. Measure a food. Weigh the full cup or spoon. From now on, you can measure that food but enter the previous weight. Repeat for all the foods.)

2. Learn to find accurate database entries. When you scan barcodes, verify the listing against the label. When you search, look first for USDA values.

3. Be honest. This took me months of logging to master. My diary was private, so I was only lying to myself. I'd get mad at myself for doing it, but it still took months to be 100% honest w/ myself.

4. Don't eat back all your exercise calories. Try half. If you can afford it, get an activity tracker, like Fitbit or UP by Jawbone. I didn't lose much weight at all until I got one.

5. Open your diary. There are people here who want to help you.

How long have you been on this program? Sometimes it takes several weeks for the weight loss to show. I'd also recommend taking log of every single thing you eat. If you don't, you'll forget and it really adds up. Best of luck to you.

From looking at your diary I would guess your goal is 2,000 calories per day? You have to make sure you are logging every thing and cut back on the sodium. It's in the red on several days. Alot of restaurants now have a "light" section to the menu. You could order from there or get vegetables for the sides. Any little bit helps. If the dinner plate is large, eat half and take the other half home for lunch the next day.
I will say that if you have a higher calorie food day, then don't eat the exercise calories.

This is the answer

http://www.acaloriecounter.com/blog/why-am-i-not-losing-weight/

If you're consistently not losing, it's not water weight. You're not eating at a deficit. Weight loss takes a whole lot of trial & error to find what works for you.

Read this: http://www.myfitnesspal.com/topics/show/1080242-a-guide-to-get-you-started-on-your-path-to-sexypants

When using MFP, or any other weight loss tool involving calorie counting, you need to check estimates against results. If you're not losing weight, then by definition you are eating your maintenance requirement, including exercise, so the way to lose weight is to eat fewer net calories. When I started with MFP, I set it to 1.5 lb./week loss, but I was really losing only about 1.1 lb./week. I'm not a freak of nature, so apparently I was underestimating my net calories by about 200/day. I was happy with that rate of loss, but it was sobering to realize that despite my best intentions, I was missing around 10-12% of my calories every day.

It looks like you're overestimating exercise calories, at least on the bike. Your diary has entries such as 30 minutes of light stationary cycling for 352 calories (from Tuesday). That's nearly 12 calories a minute. To burn that many calories per minute, I need to be cycling around 18-20 mph, with an average heart rate of 155-160, and sweat pouring down my face. When I'm cycling at what I consider to be a light speed - a speed around 12-13 mph, where I can carry on conversations, daydream, etc., without concentrating on cycling - I burn more like 5-7 calories a minute. (At 10 mph, I burn about 4.5 calories a minute.)

I would recommend using a heart rate monitor if you can afford one. For the greatest accuracy (short of calorimetry), check out those that use Firstbeat's proprietary algorithm, which is a lot more accurate than typical HRM estimates:
http://www.firstbeat.com/consumers/heart-rate-monitors

Whatever method you use to estimate exercise calories, you should use your results to tweak your goals appropriately.

[ETA: clarification of one sentence.]

Have you talked to your doctor? There may be a medical reason.