If I am not wrong, in 44AD when your profit becomes less than 6/8%, one needs to opt out from 44AD and move to 44AB for the next 5 years with the 5-year audit.
But is there any relaxation regarding the Audit rule if the person is a senior citizen and/or if someone is moving from the old regime to the new tax regime?
Yes, your understanding is correct. If someone opts for the presumptive taxation scheme for their business under section 44AD, they need to continue with the scheme for 5 years. In case they opt out, they have to undergo a tax audit for 5 years including the year in which they opt out.
No, there’s no exception available to this rule even if one is a senior citizen. Moreover, the choice of regime does not affect the audit applicability as well.