Are there signs to tell the age of a surgical wound?

Yes: Wound healing has been very well studied in the first 7-10 days the wound usually heals but the scar matures and fades and softens for up to a year after that they remain stable.

Wounds: Nothing you could stick to.History is the most reliable...........There are many factors affecting wounds.

Yes: A recent surgical wound has a linear scab, there may be firm tissue like rope beneath the skin, there may be sutures or staples present obviously. As the wound heals the scab disappears but the rope like tissue persists for months. The wound isn't completely healed for a year or so, and then it becomes a thin white or sometimes red line.