it is a good tutorial, but for those getting into retouching for clients, I would suggest that for men with such severe wrinkles, I would only use an opacity of about 10% on the retouch layer. With the amount this tutorial shows on the retouch layer, the wrinkles are not convincing of being of a younger person but of a retouched person. Additionally, men with wrinkles = character...women with wrinkles = age. The approach to retouching men and women is totally different.
The whole objective with real portraits and retouching is to make the changes believable and that is achieve with very minor corrections and mastering the opacity slider.
I recommend that people who want to learn serious retouching get from
www.software-cinema.com the retouching videos from Jane Conner-Ziser who is a master artist and photographer specializing in making retouching believable.