– Q. Dear Rabbi; does someone who is already a bit aged and it is a bit difficult for him to have to stand for all the selichos, when everyone else in shul is standing, (they are younger). Should he better look for another minyan, so he will not be the only on seating down?

A. Eliahu Rabbah (581: 9) quotes Kitzur Hashelah and Mateh Ephraim (18) that it is better to stand while reciting selichos. However, one who has difficulty in standing, should at least do so if possible when saying “Kel Melech Yoshev” and the “Thirteen Midos”.

Halichos Shlomo (Tefila 6, Orchos Halocho n. 380 was indeed careful to comply with the above.
Nonetheless, in our case it is a commonly accepted behaviour.

Rabbi A. Bartfeld as revised by, Horav Yaakov Hirschman, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a