志学 is read as しがく (shigaku) and means age 15.
しがく
shigaku
しがくかんだいがく
Shigakukan University
どうししゃじょしだいがく
Doushisha Women's University
どうししゃだいがく
Doshisha University
にゅうがくしがんしゃ
applicants for admission
こころざし
gift (as a token of gratitude)
こころざす
to plan
しこう
intention
しぼう
wish
しがん
aspiration
しし
imperial loyalist samurai of the Bakumatsu-era
しこうかい
Shikōkai (faction of the Liberal Democratic Party)
しこうせい
intentionality