Choosing jeans should be based on fit, and how they look, not on your age----but there are some cuts and manufacturers that can help narrow your choices down from the hundreds of options out there.
A quick way to update your look is to choose a newer silhouette. Straight leg and boot cut jeans are wardrobe essentials---for good reason. Boot cut jeans, especially, are flattering and slimming. But instead of buying your third (tenth?) pair of bootcuts, how about trying flared, trouser or skinny styles instead?