Architecturally, I'd say "really new" is since ~1970 (i.e., post-Brutalism), "new" is since ~1918 (i.e., post-WW1). In terms of town planning, I'd probably cal

Architecturally, I'd say "really new" is since ~1970 (i.e., post-Brutalism), "new" is since ~1918 (i.e., post-WW1). In terms of town planning, I'd probably call anything 20th century "really new", and "new" being anything from the Industrial Revolution onwards. Therefore, I'd claim New Town isn't new, yet alone really new.