I was 14 when the N64 launched, I was very happy to get it at that time, and I continued to enjoy many games on the system as I got older and still enjoy the system to this day, so meh to this argument that age plays any role in one's fondness or lack thereof of the N64.

Also, I feel sorry for anybody who feels any games are too "kiddy" for them, unless we're talking edutainment games or something. If your maturity and/or masculinity is threatened by a cute, family-friendly game, then grow up. There's more to gaming than cursing, gore, and bouncing breasts.