I've been using dating sites for some time now. I have been living alone since my partner died back in 2000. I'm now in my 60s and don't want a committed relationship right now. I look for women in my age group, +/- 10 years and have had many replies from all ages.
Use them if you understand why most other users are there. You need to establish early on exactly what it is the other person is looking for. Don't be afraid to ask detailed questions. They need to know what I want from them, they need to know what they want from me, so that there are no embarrassing surprises.
If all the answers, well, most of them, are what you are looking for, then arrange a meeting.
Good luck!