One who is interested in the collection and study of postage stamps
Mid 19th century: from French philatélie, from philo- ‘loving’ + Greek ateleia ‘exemption from payment’ (from a- ‘not’ + telos ‘toll, tax’), used to mean a franking mark or postage stamp exempting the recipient from payment.
“You should show him the collection, he’s a hobby philatelist.”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels