As-Salâmu 3alaykum wr wb.
And what about their 3aqidah ? According to which school are they teaching ? (ash3ari ? maturidi ?...).
Sista mamuna what have you decided ?
I really think that you don't have to be afraid of your age...
Make the istikhara, in shâ Allâh, and tawawkkul 3lâ-l-Lâh !
Wa-s-Salâmu 3alaykum wr wb.