When Sirius had said 'older,' he'd meant it. Not gray-at-the-temples old, not 'carrying a cane' old, but visibly aged past the few golden years of Hogwarts and just beyond. It wasn't as bad as it could have been, given Azkaban, but he was thin. He'd put on a little weight while onboard the Abduction Express, in spite of the rationing, but then the month of murders and shadows had taken that all back off. The crazy-man hair and stink of the prison were gone, leaving a vague disreputable scruffiness behind. He had more beard and less hair that he'd preferred in his early twenties, but at least he looked as if he practiced regular hygiene. That alone was a step up from his first train-encounter with Lily.
He also looked a little hung-over. That, at least, was fairly normal - like a night on the town before the world had gone to hell and the war had claimed those dearest to Sirius.
Although he wasn't precisely running, there was definitely some haste to the footsteps that carried the now-older wizard into the car where his friend was seated. He'd been steeling himself the whole way: don't crack up. Don't tear up, don't stop walking, don't stare, and absolutely don't say a word about the deaths. He'd made that mistake with Lily and, while he wouldn't take back giving her the information he'd passed along, he might have changed the manner in which he'd done it.
Sirius wanted to say something like 'prat, of COURSE you'd wait to make your entrance until it would have the biggest impact' but when he laid eyes on his best friend, the words wouldn't come out. In lieu of sarcasm, there'd be an attempt at a hug, seated James or not.
"It's about ruddy time," Sirius grumbled, hoping that the tightness in his throat came off as a growl and not sorrow.