Surgery risky with elderly?

Get it fixed with a local if that is an option. Sometimes anesthesia can have a lasting dementia effect. Or affect? I get those messed up all the time!

Affect is a verb, effect usually a noun.

In the procedure for inguinal hernia, which can be done with local anesthesia and sedation, the surgeon makes an incision in the groin and pushes the protruding tissue back into the abdomen. The surgeon then sews the weakened area, often reinforcing it with a synthetic mesh (hernioplasty).

This is about as easy and simple a surgery as can possibly take place, where general anesthesia is not even required. I'd stop worrying if I were you and let the specialist advise your dad accordingly when the time comes.

He is only 77 get the hernia fixed. What other issues does dad have that makes you reluctant to be for this surgery?

You're going to see the specialist to get expert advice on the options. Discussions will include the risks and benefits of each option. What would be the point of seeking specialist advice if you've already made up your mind to reject it?

How old is your dad?

How is your Dad's emotional state? Is he tired of living or does he have 5 and 10 year goals?

Is your Dad mentally alert enough to make the decision, if there is any decision to be made?

I don't know anything about that type of surgery. Is PT involved after the surgery? If so, would your Dad be willing to do the PT? If he doesn't do the surgery, is he willing to live with the long term consequences?

Is your Dad seeing a geriatric doctor? Maybe you should get another opinion.

I am aware that surgery in elders is risky, however, sometimes it has to be done. I believe that the success of recovery after the surgery is highly dependent upon the person's mental attitude.

I wish you the best.

Is this new?
Yes, there is a slight chance of a strangulation of bowel when there is hernia, and the need then of surgery for certain. But it usually doesn't happen.
I would try to get all the options, because ANY surgery is dangerous for ANYONE at ANY TIME, but you are correct that in the elderly, even the mere administration of anesthesia is dangerous. While hernia surgeries usually go very well now that the meshes are no longer used, and recovery is usually without complication, there are more dangers for our elders than for our youngers.
Best wishes in making this decision. Make the surgeon discuss all options with you. If they don't have time to answer all questions then I would not use them.