Undefined property Gedcom\Record::age

[Colinsp]

I am getting this error and AGE is a valid gedcom tag for any Event.

Any pointers for adding additional tags?

1 CENS
2 DATE 6 JUN 1841
2 PLAC Newton St Loe, Somerset
2 AGE 60y
1 RESI
2 DATE 6 JUN 1841
2 PLAC Newton St Loe, Somerset
2 AGE 60y
1 OCCU Farmer
2 DATE 6 JUN 1841
2 PLAC Newton St Loe, Somerset
2 AGE 60y

For example