Um, yes? Unless he'd forgotten about Susan, so then maybe yeah... but how likely is it? Very unlikely.The Doctor's been through 12 regenerations and close to 2 thousand years older by now. Would he even remember Ian and Barbara?
For the sake of argument, would a parent necessarily recognise one of their children's childhood friends many,many years later if they hadn't seen them at all in the interim?
No... as evidenced by one of my infant school (i.e. age 4-7) classmates turning up as a newly-qualified teacher at the school my Mum teaches at 25 years later.
