Hi Lucille: First of all -- welcome to the forum, and welcome back to riding!

When we came back 4 years ago, our first ride on our hybrids was 5 miles. WOW!! We thought that was pretty fantastic, and felt good, so the following weekend we rode 11 miles --- not good... my quads quivered all night if I stopped moving. We pulled back and rode less the next weekend, and gradually added mileage each week (generally, following the 10-12% rule each week). I think it took a few months before 20 miles was our typical ride. A year later, we rode 50 easy miles with a very tough hill at the end --- prior to this ride, our longest was 30-something.

Try to ride as often as you can, and remember the 10% rule: generally, don't increase distance/intensity/speed more than 10% each week.

And keep it fun! If it's fun, you'll stay with it.