So... there actually wasn't an experience system in Classic Traveller. MegaTraveller had one but I don't think it actually had any relation to age or existing s

So... there actually wasn't an experience system in Classic Traveller. MegaTraveller had one but I don't think it actually had any relation to age or existing skill levels, just whether the character accomplished tasks or not. Anyway, Traveller was unusual in that it used age in a slightly meaningful way, but it definitely got away from the trope of all PCs being young and/or inexperienced.