I started riding at 49 and still going. Learned as I went and still learning. These nuggets worked best for me: 1) Decide what kind of biking you want to do - road, mountain; 2) Buy an entry level bike built for either discipline but not both aka hybrid; 3) Focus on comfort and fit - pay for a fitting; 4) Join local bike club - it's friendly, you'll learn and fun to ride with others; 5) Set a weekly mileage goal and stick to it; 6) Test your enjoyment & commitment for 2-3 years, if you love it like i do, expect to buy another bike - lighter, stiffer, faster; 7) The sky is the limit on where you take it - as Greg Lemond famously said: "It never gets easier, you just get faster".