The age limit for free bus passes could be raised as a consultation on the benefit gets under way.
Transport minister Humza Yousaf has issued a call for views on proposals aimed at making the concessionary travel scheme affordable in future.
More than 1.3 million over-60s and disabled people benefit from the free bus pass, accounting for about 145 million journeys each year or a third of all those made in Scotland.
The scheme is facing a £9.5m cut in the 2017-18 draft budget despite rising numbers of older people.
Yousaf insisted passes would not be taken away from those who already benefit or are due to obtain one before the changes come in.
Labour said the SNP has “no mandate” to make cuts to the bus pass budget as no such policy was in their manifesto for the 2016 Holyrood election.
The new consultation looks at whether the age of eligibility should be raised in one go or gradually to bring it into line with the state pension age, which will be equalised for men and women in 2018.
This topic has been raised many times, the most recent in January 2017