Try to really feel your weight going down into the ice through your blade.
While not essential for a one foot glide, I would say make sure you have plenty of knee and ankle bend - check that when you look down that what you can see is your knee, hiding your toes (though of course don't look down the whole time as you should skate with your head up, not down).
Your skate should be under you, not off to one side. If your feet are nice and close together when you lift one of them to glide, this will mean you don't have as far to shift to get the skating foot underneath you - try to imagine a line through you going down from your belly button (or better still from the middle of the top of your head).
The slower you go the wobblier you get - though obviously going super fast will just scare you - but try to get a reasonable push to start off.
Gliding with control on one foot is actually not that easy and lots of lower level skaters who think they can skate a bit do it badly in my experience. If you can do it well you will find lots of other things easier. I think it's excellent thing you can practice for extended periods and it will reward the effort you put in.
Above all I would say try to relax and feel your weight going into the ice. It's a feel thing. Maybe a good way to avoid toepicks is to focus on the weight going through the middle part of your foot - not the toes, not the back of the heel but somewhere just behing the ball of your foot (sorry I am trying this without skates on so can't quite remember exactly where my weight is). A coach I know showed me her toes could point up 90 degrees from so much flexing of her foot when placing the boot on the ice, to avoid toepicks - so flex your foot.
As for the others half your age who are already jumping etc - first I bet some of them are jumping and spinning and skating badly, with little or no edge control. They might look better than you but neglecting basics is typical for beginners and beginner lessons in my view and I doubt they are as good as you think they are. You should be able to glide on one foot for the entire length of the rink, putting your other foot down when YOU want to, not before. Can they do that? Secondly unless you're in poor physical shape because of your advanced years then the fact they are half your age is not overly important. Younger people, especially children, may have a bit more confidence, and children may have more flexibility, but I am over 50 and lots of people half my age are weak and stiff compared to me, and I am only what I would term in reasonable shape - not exceptional. Once you get into your 20s I think it's hard to learn whatever your age. Maybe if you are 60+ you are a bit more fearful of falling - if so then you can wear some protective gear if that helps. If you compare yourself to others, it's a dangerous game. If you find it motivating or instructive because it helps you understand what you can do better then fine, if you find it depressing and you can't channel that into energy to work harder and smarter then just don't go there - instead focus on YOU anre what you need to do to get better and what your achievements are from month to month. Be patient and determined. Everyone learns at different speeds but aaside from talented kids and exceptional adults no one learns to skate really well in a hurry. It's a slow process that requires passion and dedication. You have to learn to relish and enjoy the process. I started skating with lots of people half my age. Other than my daughters, now more or less grown up, I don't see ANY of them at the rink - I am still skating 10 years later, occasionally mistaken by people who don't know any better for someone who can skate.
Hope some of this advice proves useful. Skating has been immensely rewarding.
