While not Traveller proper (but you sked for that too, if I read you well) 2300 AD (not MgT, but classical one) had rules for developing a colony according its age and intesitiy of colonization.
Being for 2300AD, no provision for colonies older than 120-150 years are there, but I guess there can be extended. And, as Kliggs say for MgT 2300, tech is quite different (e.g. the importance given to interface facilities in 2300, as no gravitics exist).