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I edited your question to make the language more precise because they're just computer programs. Here's my question and the answer you wanted:

Q: What is the mathematical average of the ages of rock stars performing concerts?

AI Overview
Based on concert revenue reports from 2019, the average age of rock stars and other top-grossing musicians on tour is around 53 and rising. This number is heavily influenced by the continued touring success of "legacy" artists who have been performing for decades.

Factors influencing the high average age

Established success: Older, classic rock acts like the Rolling Stones, U2, and Metallica have a massive and dedicated fanbase that can afford higher ticket prices, ensuring their tours are consistently profitable.
Older fans: The fanbases for these legacy acts are also aging and tend to have more disposable income to spend on high-priced concert tickets.

Statistical impact: The presence of a few very old, highly successful touring artists can significantly skew the average age upward, overshadowing younger rock acts. For example, in 2019, artists like Elton John (72) and Fleetwood Mac (with members in their 70s) were among the top 10 touring acts.