Architecturally, I&#x27;d say &quot;really new&quot; is since ~1970 (i.e., post-Brutalism), &quot;new&quot; is since ~1918 (i.e., post-WW1).<p>In terms of town planning, I&#x27;d probably call anything 20th century &quot;really new&quot;, and &quot;new&quot; being anything from the Industrial Revolution onwards.<p>Therefore, I&#x27;d claim New Town isn&#x27;t new, yet alone really new.