Can anyone Clarify when exactly Sion Died?

I just want to apologize to anyone becoming more confused after reading this post, but I hope I clarify my question enough for the majority of readers to understand.

But here are the websites I received my information on, If you are confused to what I am saying you can refer to these links

http://promo.na.leagueoflegends.com/en/reborn/ http://leagueoflegends.wikia.com/wiki/The_Black_Rose

Ok, I was reading Sion's lore and it said he killed Jarvan the first and i assumed J1 was J4's great-grandfather

Now back to J1 and Sion, since the oldest someone can get and still be able to fight is around 70 years old which can put J2 at the oldest in his early 50's. which puts J3 at most around mid 40's and J4 at most mid twenties. But I'm actually assuming that J4 is really in his mid to late 30's in the present LOL game. So at the earliest, Sion died around 10 years ago. But I really doubt that the Jarvans had their children in their late teens so if they actually having their children in their early twenties, this puts Sion to die around 30-ish years before if J1 was in his late 60's when J1 died as well.

But there is a section called "seed of doubt" where Leblanc, Vlad and another guy addressing the great general (Boram Darkwill) losing his greatest supporter (which I assumed it is Sion) as if Sion just died. However, the "Seed of Doubt" really confused me, I figured that both Vlad and Leblanc are at most in their late 30's. So this raises the question, is Leblanc really the deceiver and is in fact in her 60's and uses her magic to make her appearance youthful and Vlad is using magic to look youthful as well?

It also brought up another issue, dead flesh preservation is about 30-40 years in air tight tomb for the flesh to start to lose most of its moister/fluid (using Pope John XXIII's example). but seeing that Sion may was never intended to be resurrected in the future would have him decaying to a skeleton in around 10 years in an air tight tomb. which my theory would result Leblanc resurrecting Sion 10 years after his death would in fact have him looking like a skeleton.

However if he was preserved with magic, it might make more sense and throw everything I wrote in the paragraph above out the window. But the issue between the conversation in "Seed of Doubt" and J1 and Sion's fight still confuses me. I personally felt Sion died around 40-50 years prior to League of Legends present day but if it was 10 years ago, it really messes with the lore.

Or am I getting this all mixed up in the "Seed of Doubt", they were talking about someone else and Sion actually died around 30-50 years ago and in Sion's memorial speech delivered by Boram is referencing to Boram Darkwill's early career as a soldier/commander in his earl twenties if we assume Boram is in his late 60's to early 70's?

I might also be mixing Sion's old lore with the new since riot is reworking the lore, I might have been confused there.

If anyone can help me answer this question I would really appreciated it, If any rioter can help, it would gave me some peace of mind. Thanks!

edit: I messed up in my info, Vlad resurrected Sion :p