Oh that would make him 5 years older than natsuhi.
Too bad we don't really have any info on Rudolf, however Kyrie's age can be easily narrowed down.
We know that she was working for Rudolf even before he married Asumu and
It is not realistic to think she was younger than 18. so Kyries age is 36+ However she also had a child in 1980. And it wouldn't be realistic to think she had it when she was older than 40. So kyrie's age is between 36 and 45, probably 40.