I'm 66 and even use clipless on rollers - Main thing IMO is to learn how to adjust tension on the clamp mech then practice getting in and out. I keep my tension pretty low. Also, don't be afraid to try different shoe cleat positions till it feels right. May help to lower the seat while practicing. Shoud take about 1/2 hour to get the hang of it. I like the SPD style clips because you can then use either race style shoe or touring shoe. Either type will allow you to walk around normally instead of the "duck walk" required with full on race/road cleats.

Another possibility - there are pedals that have flats ( for regular shoes ) on one side and SPD on the other - I like those on mountain bike where sometimes I wand to take a spin without changing shoes.