SEXAGENARIAN
Meaning of SEXAGENARIAN in English
sex ‧ a ‧ ge ‧ na ‧ ri ‧ an /ˌseksədʒəˈneəriən $ -ˈner-/ BrE AmE noun [countable]
someone who is between 60 and 69 years old
Longman Dictionary of Contemporary English.
Longman - Словарь современного английского языка.
2012