The features were certainly those of a Forsyte, but the expression was more the introspective look of a student or philosopher.

He had no doubt been obliged to look into himself a good deal in the course of those fifteen years.
To young Jolyon the first sight of his father was undoubtedly a shock--he looked so worn and old.

But in the cab he seemed hardly to have changed, still having the calm look so well remembered, still being upright and keen-eyed.
"You look well, Dad." "Middling," old Jolyon answered.
He was the prey of an anxiety that he found he must put into words.
Having got his son back like this, he felt he must know what was his financial position.
"Jo," he said, "I should like to hear what sort of water you're in.

I suppose you're in debt ?" He put it this way that his son might find it easier to confess.
Young Jolyon answered in his ironical voice: "No! I'm not in debt!" Old Jolyon saw that he was angry, and touched his hand.

He had run a risk.