Is it permissible for a religious lecturer in his fifties to train women (around 35 years old) in training skills by being with them in the same place without a barrier, while display tools are available that enable discussion and inquiry?

A man who is fifty years old and women who are thirty-five years old are not permitted anything with each other except what is permitted between any other unrelated men and women. If a woman needs to learn from unrelated men due to the unavailability of a female alternative, it is permissible under the following conditions: absence of khalwa (definition) (private seclusion), adherence to hijab (definition) (veil) and modesty, refraining from speaking in a soft or alluring manner, not displaying adornments, ensuring that the skills are permissible and suitable for her nature, and obtaining her husband's permission to go out. If these conditions are not met, then it is not permissible.