Saw your other post. Family first, then stamps. Good on you!
Have no children so stamps are my second family.
As for this post, now you have to get yourself a good pair of reading glasses or a good lighted magnifer on a stand. I had to get reading glasses when I went north of 50. I occassionaly use an old student metal caliper when they threw them out when everyone was going digital. Not much use on stamps but don't need batteries and helps save the environment.