1-15: 97 Logs. Logs sell for about 50 a piece, so about 5k.
15-30: 293 Oak logs. Oak logs sell for about 80 a piece, so about 23.4k.
30-60: 3,858 Willow logs. Willows sell for 8 each, so about 30k.
60-70: Either 2,651 Yew or 6,873 Willow logs. Yew logs sell 495 each, so 1.3M. If you choose to go with willows, you will make 54.9k for that.
The problem with Yews is that they are really slow at 60, so I recommend doing willows at that level. Also, the wealth gain is how much you gain between logs, so put those prices together.