UK licences are required to be renewed when the holder turns 70, whereas an Austrian licence does not have a fixed expiry date. However, standard health checks apply to all ages when applying as a 3rd country national3rd country nationals Third country nationals are citizens of non-EU/EEA countries. Residency and naturalisation procedures for third country nationals are more complicated than for citizens of EU Member States or EEA signatory states. for an Austrian licence (since 1 January 2021, this has also applied to British citizens exchanging UK licences for an Austrian one).
Further information can be found about exchanging a UK licence for an Austrian one on the oesterreich.gv.at website at: –https://www.oesterreich.gv.at/en/themen/dokumente_und_recht/fuehrerschein/3/Seite.040500.html
Note: If your UK licence has expired or needs renewing you will require a certificate of entitlement from the UK DVLA in order to apply for an Austrian licence.