You'd need a mountain bike or trekking crankset to get to 19. Really, really low. You'd be going so slow in that gear you'd have trouble staying upright!
A trekking setup with a 26 up front and a 34 in the back would give you 20 gear inches.

If your current crankset has a 36-tooth chainring, you have a compact crankset. 38 is the smallest number of teeth on a regular double. Easy changes you could make would be to:
1. swap the 36 for a 34 up front. You don't need to replace the whole crankset, just the chainring. Easy peasy.
2. get a SRAM cassette that goes to 28. Shimano rear derailleurs are rated for 27, but can handle 28 teeth.

Making those changes would get you down to 32 gear inches.

Don't underestimate those 62 year old legs of yours, though. I know plenty of women in their 50s and 60s that kick butt on the bike. And these aren't women that have been riding for decades.