Retirement Date Using Auto-Complete Rules

Hello,

We are trying to default the retirement date of an employee to 1st Oct of the year of their 60th birthday if their birth is before 1st Oct and 1st of the next year if it is after that using autocomplete rules. We have been able to develop a basic rule which can default to their 60th birthday but not 1st Oct of that year or the latter requirement. Would appreciate any help regarding how this can be achieved. Thanks!