If you are talking about bows that are 45 - 50 years old, one or two years is not going to make the big a difference.
As TOAD said, not all bow and models are as collectible as others. A lot depends on the Brand, model year, condition, and the draw weight. The really heavier bows are harder to come by, and will usually carry a better collectors value.
It would help to know what bow you are talking about.
Is older better, sometimes yes sometimes no. In my opinion, a mint 1970 B riser is worth more than a Mint green stripe, 66 Kodiak is worth more than a 65 Kodiak.
Rarety also plays a roll. Post here that you have a 1967 Kodiak with a "7" as the first digit, and watch the collecting community come alive. If that bow exists at all, it would be worth more than one each of all the other kodiaks from the '60's put together.
Let us know what you are talking about and you will get a collection of various opinions from us. However...do yourself a favor and don't tell us where we can find it...you might find that is has mysteriously been sold while you were making up your mind.
As a new collector, you should spend a lot of time on this Forum and on e8ay reading and learning. I have been collecting longer than many, and not so long as most, and I learn something here every day. On this forum, no one knows it all, but collectively we know all there is to know. Who knows, one of these days you my be the one that broadens our enlightment on a particular issue.