More pertinent IMO is his back aching. Whether or not the Buddha's back "actually" ached is very significant in determining if you've a more "Theravāda-ish" or "Mahāyāna-ish" Buddhology, as I see things.
Look like you havent read SN 22.1. Also you havent understood 4NT.
Dukkha is Panc
upadanakhandha. So stress/suffering/unsatisfactory only occured if you have upadana (personalization of self).
So you have dukkha only when you
hold onto the panca khandha as
yours. Arahant and Buddha have depersonalized panca khandha. Whatever arise, they dont care whether happy or sad or dukkha or sukkha or anything. Their Upekkha is fully estasblished. Heck they even throw away the dhamma, because the job is done for Arahant/Buddha.
They only think ah… this body is suffer, but my mind is not. So no dukkha there.
Btw, When you are old, it is not easy to maintain high Jhana.
May you be relax, happy, comfortable and free of dukkhas from hearing true dhamma.
May you gain unshakable confidence in Buddha, Dhamma and (Ariya) Sangha.
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Dhamma Characters.