You can refer to things which last for only a short time as ephemera.
[literary]
2. uncountable noun [oft adjective NOUN]
Ephemera is things people collect such as old postcards, posters, and bus tickets, which were only intended to last a short time when they were produced.
...tickets and other printed ephemera.
...Victorian ephemera.
ephemera in British English
(ɪˈfɛmərə)
nounWord forms: plural-eras or -erae (-əˌriː)
1.
a mayfly, esp one of the genus Ephemera
2.
something transitory or short-lived
3. (functioning as plural)
a class of collectable items not originally intended to last for more than a short time, such as tickets, posters, postcards, or labels
4. a plural of ephemeron
Word origin
C16; see ephemeral
ephemera in American English
(ɛˈfɛmərə; ɪˈfɛmərə)
nounWord forms: pluraleˈphemeras or eˈphemerˌae (ɛˈfɛmərˌi; ɪˈfɛmərˌi)
1.
mayfly
2.
a.
an ephemeral thing
b. [with pl. v.]
ephemeral things collectively
3.
printed matter (as theater programs, posters, guidebooks) meant to be of use for only a short time but preserved by collectors
Word origin
ModL < Gr ephēmeron: see ephemeron
Examples of 'ephemera' in a sentence
ephemera
The ephemera of the great and the good -- or the great and the bad -- is valuable these days."
Harcourt, Palma DOUBLE DECEIT
I was a contradiction, a quasi-immortal masquerading as one of the ephemera who had saved me from their own short-lived lot.