In Jainism, angaluchana refers to the ritual of gently touching or wiping the main idol (usually of a Tirthankara) and nearby idols in a temple with a clean, often wet, cloth as an act of devotion and respect. There is no strict age restriction in Jain scriptures regarding who can perform angaluchana, but there are some important guidelines:

1. Purity and Cleanliness: The person must observe proper cleanliness, including bathing and wearing fresh, simple clothes (usually white for laypeople).
2. Physical Ability: The person should be physically able to perform the ritual without causing harm to themselves or the idols.
3. Ritual Restrictions: Traditionally, certain rituals in Jain temples are performed by those who are free from certain physical or ritual impurities (such as women during their monthly cycle, or anyone who is ill or has open wounds, might be temporarily restricted).
4. Temple Customs: Some temples may have their own specific rules regarding age or who may perform angaluchana, so it is best to consult the temple authorities.

At the age of 70, if she is healthy, maintains proper cleanliness, and the temple allows it, she can perform angaluchana of the main idol and nearby idols. Age itself is not a restriction in Jainism for this act of devotion, as long as the above conditions are met.

Important Note: Always respect the traditions and rules of the specific Jain temple, as practices may vary by sect (Shwetambar or Digambar) and local customs.