Hi Wolf63,
Please do not take offence at this, but a bit of walking just aint gonna do the job.
I am a 41 year old guy and have tried pretty much every diet I have heard of, but in the end, it comes down to simple mathematics in most cases. If you eat more calories than you burn, you will gain weight, and vice versa. Also, the older we get, the harder it becomes to lose the weight.
In my case the main problem was portion size, and even though I was going to to the gym 4 times a week, I ate enough for 3 people.
About 3 weeks ago I decided enough was enough, I cut my portions down to a resonable size, I cut out the sweets, crisps and cakes, and still go to the gym 4 times a week. I also do some stretching and 500 sit ups at home 3 times a week.I have now lost a stone in weight, but I have to admit it is bloody hard work.
Good luck with losing weight, and I hope you enjoy the Sci -Fi convention.