from math import inf

age_milestones = [-inf, 0, 15, 20, 25, 30, 40, 50, 70, inf]
age_titles = ['контрамот', 'спиногрыз', 'тиктокер', 'зумер', 'миллениал', 'поздний миллениал', 'бумер', 'совок', 'старпёр']

age_dict = { k:v for k,v in zip(age_titles, zip(age_milestones[:-1], age_milestones[1:])) }

check_title = lambda a: print(*[t for t,ag in age_dict.items() if (min(ag)<a and a<=max(ag))])