Hello from JA
A clinical psychologist [phd] or a psychiatrist, and preferbly the latter needs to evaluate this.
Many people have symptoms of bipolar but are not bipolar.
But in adults is is standardized as far as diagnosis and there are clear criteria than can be evaluated in the office.
If this 41 year old is willing to get an evaluation...you are home free.
If not, then it is going to be very difficult.
One can not force an adult to get care.
So, I do not have much in the way of detail from you...let me know if you have more, just use reply.
OK. If you have further questions or details, use reply to expert.
Otherwise please choose a positive rating . But, still come back if you need to…think of something later, etc. Bonuses are appreciated.