His Grace of Osmonde by Frances Hodgson Burnett

As they rolled over the roads on their way homeward, in the darkness of their coach, my Lord Dunstanwolde spoke of his happiness and told its story. There was no approach to an old lover's exultant folly in his talk; his voice was full of noble feeling, and in his manner there was somewhat like to awe of the great joy which had befallen him. To him who listened to the telling 'twas a strange relation indeed, since each incident seemed to reveal to him a blindness in himself. Why had he not read the significance of a score of things which he could now recall? A score of things? -- a hundred! Because he had been in his early prime, and full of the visions and passions of youth, he had not for one moment dreamed that a man who was so far his senior could be a man still, his heart living enough to yearn and ache, his eyes clear to see the radiance others saw, and appraise it as adoringly.

'Twas the common fault of youth to think to lead the world and to sweep aside from its path all less warm-blooded, strong-limbed creatures, feeling their day was done for them, and that for them there was naught left but to wait quietly for the end. There was an ignobleness in it -- a self-absorption which was almost dishonour. And in this way he had erred as far as any stripling with blooming cheeks and girlish love-locks who thought that nine and twenty struck the knell of love and life. 'Twas thoughts like these that were passing through his mind as they were driven through the darkness -- at least they were the thoughts upon the surface of his mind, while below them surged a torrent into whose darkness he dared not look. He was a man, and he had lost her -- lost her! She had become a part of his being -- and she had been torn from his side. "Let me but look into your eyes," he had said, and he had looked and read her answering soul -- too late!