a. 老朽的, 狂热的

gaga \gaga\ adj.
1. mentally or physically infirm with age.

Syn: doddering, senile.
[WordNet 1.5]

2. marked by foolish or unreasoning fondness; as, gaga over
his girlfriend.

Syn: crazy about, dotty, enamored, infatuated, in love,
smitten, soft on(predicate), taken with(predicate).
[WordNet 1.5]