I started using clipless pedals when I was 45.
It took me 10 years to get completely comfortable with toe clips & straps (aka, cages). It only took me two weeks to get completely comfortable with clipless pedals. Never going back.

So clearly it's not too late to teach an old dog new tricks...but it might be a good idea to get Old Dog-friendly clipless pedals. I started on Speedplay Frogs, and a dozen years later I'm still using them on all of my bikes.