Welcome to the 50+ forum and welcome back to biking. There are a lot of folks around here including me who are on their second cycling career. We rode when we were young but life got in the way and we gave it up. I am about 5 years into my second career and in a lot better shape than I ever was in my 40s. You can do the same thing! Like the other folks have said, start putting in some saddle time at least 4 or 5 days a week. Find a Local Bike Shop (also known around here as a LBS) that you can trust and have them help you on any mechanical issues you have with the bike. Don't hesitate to ask questions on this forum or celebrate your achievements. Ya gotta brag every once in a while about new accomplishments!

Also at some point have a look at the Sticky thread at the top of the page called: "[h=3]Sticky: For the 50+ 'newbie' rider".[/h] There are about six questions there that you can use to introduce yourself or find out about other forum members. If you like put together your own post on the thread.

Again, welcome to the forum.